Good post Guys.
What i do is fly always to and from Hong Kong and then use my pre-booked flights with Cebu Pacific to Manila { there are about 5 flights a day from HK to Manila and vice versa.}
Hong Kong is a cheap hub and a very popular destination as opposed to Manila.
Cebu Pacific has a new fleet and is beating PAL in terms of passenger footfall.
Average return flight cost is about £80 the 4-5 times i have done this.
PS Beware of " too good to be true" special offers, most companies offer these and all those offers apply to a very small amount of seats "that 350 quid deal amazingly almost always doubles in minutes!"
Always try and book early too, i mucked about for a week once on trying to get a cheap deal and in the end it cost me another 100 quid as it drew me so much nearer my intended departure date.
Hope this helps.